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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9da73596dbfa8164489698f3c42bbdfd2e55c259c4ea3cd95428888ad1724ad' 
  AND token = '7SnwzGbOEyKw530taWhha26thO0XTAzrEZ768Hfxeeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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