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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c0468b1b6e2ca381c7cfc5c8815a3ffe11863434e1c936d72ecc113ea56927' 
  AND token = 'BBReajHwT1WqLvd2VG0TqVJWCRTf9Lpu6WNkYDCF6yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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