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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdfe82c8052132dbbb3ab81a34a6f4a03f79329155b23f9b978500ca7291f32' 
  AND token = 'OePLQm7eNIFcpNpB14TYkE0reQEcfdIRnibn+qgbFGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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