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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636a0d0bb86ebe4569e3cde111f3c478a5860b034039fb8ca1ad8d1fcfdd3040' 
  AND token = 'RGQRrMmR+MzRNm5Pu1tf2A2fswaLwb57ggoDXEB3a4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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