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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0513200d37850c3f836ca6d2c9227f516c739060d630c14755cb077b6a3e10b3' 
  AND token = 'T0CbHAEAplUtQVQP9yYws2TF72OU/Mdi5p0vnOVzppQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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