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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9d6c237c93845f61147287a198e919422a86bf095eebb086ecad1a755cd689' 
  AND token = 'oTqtdwcYK2LcODNOiuWkY8rlqrrgkY2+6citD1xEses=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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