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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188dce7e5bc03d66cc64b9fa9e71a61d7023b14666e4df03d471cd0ef02a1763' 
  AND token = '4t0GhtcmBovPH+8TIf6Q6GWhRMylWmtjAGlz3navEEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}