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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb477b36dfcf1bd2c185cc5647ae222e12a1cf758dba607064b37467f2fcffa9' 
  AND token = 'GjmJ1j+BNs0d3J6deOAMw1a9iUA5vlonuJObB5BzNgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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