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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7fc381ac8b3d27f79c34dc0181e5eca68969288fa4bf8c81244a2fc8ebc4379' 
  AND token = 'r9HdOuTjo3MRp5IHITUUMjXm9qyfDr2x+w5IditA6wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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