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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef26b2c05c3bad43ac2e694e130cf8f9df7a8cb9dcce11af6a12dc40e63b862d' 
  AND token = 'jC11FGdr9C/SBdBQ0M2L3FF9l87gswJ67WlGlIbuQDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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