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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47a76f7e10fee03859d7732615f51c1587b800011e08fd6700cbc06a33b5218' 
  AND token = 'hSmYMm5rLHF0pYFSNWqQlEjN9acSXgwE6Im7uBjaU74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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