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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062d2459a666695eb0585c7b482e56cedb2bf936823ed306f937fb89fc85b97a' 
  AND token = 'iNZQApCvR1kUc0jLyafpgf9W64s0EdyHkCr8HYArF3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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