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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c008699ed1020fa6f6563c32329f95726ed243990b1954c385e74cfe7f76aea2' 
  AND token = '24Rd+k/Pn1oGBOAcWewPbJ8A8gpVn71FDVMyQhas+Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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