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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4d103435d0a5c11705b84fb227de5b2c0893380ae8dbb95429fe6c36e6407c0' 
  AND token = 'L3dCxk+Lm0WPJhPH2kRjYx1XYHoE2nde+uM4wUPXOW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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