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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecea262ac6572adcae3e242a30a2f473aaa0ae14e9b3868cab67146f6beeb06d' 
  AND token = 'LPnyIuUcL6O4GPbc4rIiThltv55vIyTg6C4v6W9n8Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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