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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9749dc144bd99b61f92beb5e6ade85a202c22483505a54f504f601877765a25' 
  AND token = 'r3iwhpoBHC5ZqUg1Gb/Qa3u9E1uuAR2tgh7NPprX/4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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