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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0096a7667b3b9bc4d2b5dd08dbc3e8967ae2efea02daec50840cc9830f87b90' 
  AND token = 't/WhkhfHeI4OMTU4cRu0cj8V/Sr2u7Grx2iB+DEYu9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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