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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affb28bbbd225e780bfdaaa50bc5d5aa8bb2c84201bbd9b13f202e2793fd12f5' 
  AND token = 'ixRo0DH7njCPCXroGKLMorP/trbOtIXZX9TyFDLf49o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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