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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a628b068f7ed9cbd95488454db7fd94f6cd17c4953af7933312c14b2342c716f' 
  AND token = 'JDLWNX5eprKvm023L6ssAOBzbSX/HbVMgs56uzXeb24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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