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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4561a76fad21084af6e7460812457edf0e4ccd7101b908821a0304fd680f04' 
  AND token = 'gZyuHqUlv2WQHJi572v+SefWp5BHwKYCoEiuQfNbB0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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