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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac6c6ff2c066ecb6bfd73d3a4360ea39806a2e17f8aacebf51d6548238c9109' 
  AND token = '7QAvj3AHhzPxxMnY0b5MDISos22W7i9Zbnr0INL4G4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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