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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56512561cdb32274aba55f5d9f1a9b6e9c1f215b8263f08e38e3c9fcb7173e0c' 
  AND token = 'TZNPffFa4uUFBU3VhDvmE36GviJj18Sgz/6fW5Vf38A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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