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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da35c8ca1ab01e2ae1aec204ef5ab1496300102cda95524d5c6f18c4a4c2d48' 
  AND token = 'suNALlf9Rd3Z2xbaKmeGn62ITkCfNQHafPYW+e5Oi1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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