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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e930a55bb09b893f7106bc2963b9d4421bc85983e4a26206a716d4d559aabeec' 
  AND token = 'dVk6R6lFg8bI0rdj1ysqQtsMIUpYmIINavqg26xCzpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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