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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c6139ec2226fbaddb53e39178d611810fdd523db1dfac1c9d85de6183e3449' 
  AND token = 'HKsQH4l4DtOAkznI6d6Slpe+1efHBpCoho3Ky3LWkqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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