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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccbd9580c176ced24c1781e5b37d197c128b08777d2ac6fe5eaae13e027a07fa' 
  AND token = 'x9FlQqhvzW03NaKFmGqNGfkOWSo/+9o2+wGl8AihK/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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