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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db70d61db3a6fc0a64f6f389f5f37baa5602b2f186e0d06558e6b19a6472485' 
  AND token = 'Q6yl2XJO0QTEMX3sR2ANrsofPTsaf6D5S3OwCGhM0pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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