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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c500e8e8bed9cc8af14b9e3b302fa4e41a56ed92e90ed7db456ea15488298de' 
  AND token = 'SCo2aZIP7keNMfDBHoIFIYona/PTOH0fGV6U7AVWu1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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