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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bbdb073435ba79f7defa3fff69fcce20652dad9821ca772c765f89e2cc00c11' 
  AND token = '5aH9iZo7wv9ELx7bH2RSv+gT4JLsGuYE89uVqsM8x9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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