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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24035e01772b33c0b5792a374224647974dd92951699d1c9ae5e212f33c3e3fb' 
  AND token = 'bco2True8VFYoy9QRnGDEFt8o949f6almOBGn8BaIXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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