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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6cca2165f48d9d63390d502f10dba08b80919c1d44bb75075193b180b875a9' 
  AND token = 'B+DKV8AMBMoIdwBhp2cxYZMkdfReopD7Aqc8p5H6XyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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