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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd873a3851889988c5c30ba3d4ee98bb612ca37761c508513ddf33b14b99ef947' 
  AND token = 'R6t2R8iSARaqmvjyznSygxDJ3v+nP3DviV5kYifte1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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