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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868850c43a785004cc2c09ab92870d23ebc120768e0251b70bff162c6fb1c3d0' 
  AND token = 'QO83MGG0tccEzO/jVK+GbqkMqkV7e2dpTmfy2O993Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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