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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03931f4146a4e04d77ce11f7cb39c665e9b0761f5cb74adcd0c13bb4585b8fdd' 
  AND token = 'eVixIcvv2Gwe/nhrdVPFFH6tbzYGAyO8HqU2r3PWC/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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