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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b1411c95627fbe47a6696cdb951bc3f5a9ffd41e20c1bf2a93d7160dabf771' 
  AND token = '79/zJVwRpayGowm/1GfD1Pzxp3om6pNJetv1X0PEgHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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