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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64799243c9f836c6cb6b10da2575d8be60f0660242c3f892590a4fe9e9a22d8e' 
  AND token = 'i6dfHJXo2wU4xWHgitO8bYnHD75qZAY+Zi6we9H4lIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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