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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4dbd25514c4de7ec5b7418028e34a0c0d7a7f6d26e388f7cdafadbf735d6650' 
  AND token = 'ZmcrA5iSvuicL3//yiZxiRLfoUbMC5jsbRB0ue3vYvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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