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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbdcfe93c875732f2389828aab9ec9429c219b46e6cb1b3f1d5009a63c251a0' 
  AND token = 'H7+GO0uRcRFL3TE0L+4y9E6WmFy/iuQ1Dxkxf6l3tuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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