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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccdd0baf9e93bc3b6c1cc52c5b68b6e6bc232b98d0981eed953b2ac7f93a5f88' 
  AND token = 'otl1Z4fP+MW+xQYXVtLcVXN3WZSDb2DncJRmYpBFXxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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