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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003c0c0debd98b2770a04aa023e4ddd57150e82becb0075f7cc4ac9cedf0cd8e' 
  AND token = '/tCWN2bZuQWCpeDkM9zJIOc6+/1GAayqwJ1ybE57GRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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