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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db465aec619efcd86393d7a7427c85d36ef9c22cd2d4bc14810e459650a62c17' 
  AND token = 's+L3en1CdygxTQA4fizadne6Xu75Hh0FRJbeQTTB2eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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