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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f164998b8b2910fcdd1609b00504668b8bb233ea3e36dbc2480ee5a1192a650d' 
  AND token = 'X9yyYOAUE5Y8CblvMsPP54DfR/i14GPN/V+BzaJrJBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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