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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffe578dc64d2f6e63d224f06ff6168220c339bd772fb4d086f8cb432bf1052d' 
  AND token = 'noLxD5ooNCO/lmF8sualasfNsm2td1pntbh/VlqnGrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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