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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041d60d82616978d3a13f693e9ddb6f796c5073ae8df583ff4620c7a65384108' 
  AND token = 'uhg9+ijSCt2BmZKfYiim53O8DqSdpAReyaWFKTbK67U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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