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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b9873cffdc350136d749e03e17de8a51881662c2a43c2719ac34314681049f' 
  AND token = 'vW+SdiznNLTNa8T6zLw6M5oE4ewxFBvfG4OKxvwwR3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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