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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc7fd8a98da6b7d41f8d0cfad71dc9e28dee216f91029448b2d16efab24fab2' 
  AND token = 'QeYhczDnc5QA1KQ2b9tOq9uPKE9/kss95mCTv6/SKKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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