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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d2c7d595cedfbfd85293ac0c035c35a3b86b42e5ee87db9e8a69014098a8af' 
  AND token = '01XltKjDHdHxD+6v9FpLEgelR8KpmrIJMpYkYwB1L7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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