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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827202a50099f80f8c2089926f2413cae1c22d5c88dcf9005b4ec32df43fae7a' 
  AND token = 'sprItWxo9g/jnVn1HRdnXh9Y4rp3LbCP6RJoR3enmw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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