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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe1b56bded1bf9fdfc8f80b955a120946bd9b1add4df2fe41d15767debc2de2' 
  AND token = '02w4+svGG4qTq+Trgouf1ARVCz0Gs+ycu34Q65n0u8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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