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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac76f543b9c1a5b1f7ad03229f18b49450f5d477eb39d6779a0a50dc6e08f992' 
  AND token = 'nDfz64vyln4xxS4nsFOzJExTXxRn9TuzV/Vn4JvIBR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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