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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556cfbeccb486727518b4d1a48073e5cdfa0519749b38da13d9c4357347a97d6' 
  AND token = 'soEs5icv1Jayz/fxJ8uVV+9EgJhJ386vIssJ+PgRNFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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