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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7747b4b51ef946794317d447d7f8f95082a146af4b55f82d90bc584f9203f82d' 
  AND token = '5geKX7vJsfObua36odx951eqQtXARwze8rL0Ii/rNyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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