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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cd26c54bca64092f96c2c84d4902a18b5a5057b38814b7443362d275d7f8e6' 
  AND token = 'l8aXszMIj63aMAEx2aKubKQ2mK5422ntoopNXE4y+AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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