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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231f33d6f9425ac7485b424a0df5654f22434cac87ed26f46b378ffe031571ef' 
  AND token = 'VTo3P+WiWglyfVXie/JHbU02avnoc1qsnFVI3GEp9P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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