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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d487c2c6a6179a5ae81cf50957d7df3e084d72042c2d469d115e906aee923b9' 
  AND token = 'TBZN/1ED48ymDGhCpnGKRD9bjI0V9Q+nnL9hArGwY5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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