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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dbee4ae200584876c29b7344f24a2fb702a4b384f2c2fed178426ffc6f84e8' 
  AND token = 'KkekZEnYkopMnPh596G/cJPUCWujIpDYvsNMw0GQYao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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