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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c793ae014874f84fffd0354d8677d1859a24c6d1006a12f905cfae8bb2c778d' 
  AND token = '9r//O99sjSP6z6hZKzTse9dAWbjt7rlbHIwhlRkmN58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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