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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7e3a7bc5d37243aed4e9f9b8b5be4022f7da2ca2dbc952951febdb29d0fea5' 
  AND token = 'pUEAXLi+eiYTBS8FXC5bq/NwBlh3tFHJueBf87KLtmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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