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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9678425e98b3b4a79b75bb7c7287a1a236b7b691ca7af7e80463719c8836d6' 
  AND token = '5BoVxQxZF/1eZTpMl3EHdc0Iwuf0BStdYfmxZX1vDzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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